Running SSIS Package Using .Net Code

I am running this code my question is when it runs ExecuteNonQuery() it doesn't wait for package to complete It just returns "Package succeeded' - The way you can test if you run this code 2 times one after another. ExecuteNonQuery() breaks with error -
SQLServerAgent Error: Request to run job RunSsisPkg (from User DomainUser) refused because the job is already running from a request by User DomainUser.

How can I check before return package is running and wait to complete before return?

using System;

using System.Data;

using System.Data.SqlClient;

namespace SSISRun

{

class Program

{

static void Main(string[] args)

{

SqlConnection jobConnection;

SqlCommand jobCommand;

SqlParameter jobReturnValue;

SqlParameter jobParameter;

int jobResult;

jobConnection = new SqlConnection("Data Source=(local);Initial Catalog=msdb;Integrated Security=SSPI");

jobCommand = new SqlCommand("sp_start_job", jobConnection);

jobCommand.CommandType = CommandType.StoredProcedure;

jobReturnValue = new SqlParameter("@RETURN_VALUE", SqlDbType.Int);

jobReturnValue.Direction = ParameterDirection.ReturnValue;

jobCommand.Parameters.Add(jobReturnValue);

jobParameter = new SqlParameter("@job_name", SqlDbType.VarChar);

jobParameter.Direction = ParameterDirection.Input;

jobCommand.Parameters.Add(jobParameter);

jobParameter.Value = "PackageName";

jobConnection.Open();



jobCommand.ExecuteNonQuery();

jobResult = (Int32)jobCommand.Parameters["@RETURN_VALUE"].Value;

jobConnection.Close();

switch (jobResult)

{

case 0:

Console.WriteLine("Package succeeded.");

break;

default:

Console.WriteLine("Package failed.");

break;

}



}

}

}